Ventilator



April 29, P941. 3 ANDERSON 2,239,767

VENTILATOR Filed Dec. 16, 1939 1 3.3 JB m T (J ei- INVENTOR 7M054 M.Aups,6oaamzat'zewm ATTORNEY Patented Apr. 29, 1941 VENTILATOR Samuel M. Anderson, Sharon, Mass, assignor to B. F. Sturtevant Company, Hyde Park, Boston,

Mass.

Application December 16, 1939, Serial N 0. 309,601

6 Claims.

This invention relates to ventilators and relates more particularly to ventilators for use in air conditioned passenger vehicles.

Ventilators are used in railway passenger cars for exhausting the stale air from the cars. prior ventilators are not suitable for air conditioned cars unless more are provided than is the practice, for handling the increased volumes of exhaust air resulting from increased volumes of outdoor air. This is especially true for the air conditioning systems I prefer in which far more outdoor air is utilized than has been the practice in the past. For example, while prior systems have utilized outdoor and. 75% recirculated air, I prefer to use 100% outdoor air at all times except when such extremely high or extremely low temperatures are encountered that the use of all outdoor air would place too great a load upon the system.

This invention provides a large opening for exhausting the stale air with two superimposed backdraft dampers for preventing windage interference due to train motion or cross-winds. It is divided into two sections, one of which may be closed by a hand operated damper within the car. When this damper is closed, the lower backdraft damper remains in its vertical position forming a sealed compartment for preventing the filtering in of fine crystals of snow in winter. In summer, both sections of the ventilator may be open with no danger of the entrance of rain, etc.

An object of the invention is to provide an improved exhaust ventilator for passenger vehicles.

The invention will now be described with reference to the drawing, of which:

Fig. 1 is an elevation view in section of a ventilator embodying this. invention with section taken along the lines l| of Fig. 2;

Fig. 2 is an end View, partially in section of the ventilator of Fig. 1, and

Fig. 3 is a plan view looking downwardly with a portion of the roof removed, of a railway passenger car equipped with the ventilator of Figs. 1 and 2.

The ventilator indicated generally by 5 is formed from sheet metal and has the two curved walls 6 and 'l and the two straight side walls 8 and 9 which extend from the ceiling ll] of a passenger car, through its roof I I. The upper curved wall 6 connects with a straight wall I2 which extends downwardly over the roof I l of the car, and the lower curved wall 1 connects with The upon the roof I! below I I is the inner partition wall M, which divides the inner portion of the ventilator into the two compartments l5 and H5. damper I1 is adjustable by the handle l8 from the interior of the car, to close off the compartment [5 as illustrated by dotted lines in Fig. 1.

The outer end of the wall 14 terminates at the pivoted backdrafrt dampers l9 and 20 which extend completely across the air passage between the walls 6, l3, 8 and 9 and which are adapted to swing outwardly under the pressure of the air in the car to vent the exhaust air and which swing to closed positions under the greater pressure of outdoor air to prevent same entering the car through the exhaust ventilators.

The walls 6, I and M are shaped for eflicient streamline air flow.

In summer, relatively large volumes of outdoor air are drawn into the car and correspondingly large air volumes are exhausted by the ventilators with the dampers I1 open as illustrated by the full lines of Figs. 1 and 2. The two compartments l5 and i6 are open and both balanced dampers l9 and 20 are in service at this time.

In prior ventilators in winter, difiiculties have been encountered due to snow entering their outlets, settling upon their lower walls, blocking the lower balanced dampers open, and then drifting into the car.

Wlith the ventilator of this invention, the damper I! may be closed to seal the compartment l5 thus preventing the lower balanced damper from swinging open and snow from entering. If snow does find its way past the damper 20, it is prevented from entering the car by the damper l'l. Although when the damper I1 is closed, the discharge area of the ventilator is decreased by half, at such time less outdoor air would be taken in and less stale air exhausted so that the reduction in area is justified by all considerations.

The ventilator may be readily adapted to monitor top as well as to turtle back cars.

While one embodiment of the invention has been described for the purpose of illustration, it should be understood that the invention is not limited to the exact arrangement described as departures therefrom may be suggested by those skilled in the art without departing from the essence of the invention.

What is claimed is:

1. A ventilator for a passenger vehicle comprising upper and lower walls extending upwardly The hand operated through the roof of, and then down towards a side of, the vehicle, a partition extending between said walls and dividing the space therebetween into upper and lower compartments, and a damper adjacent the inner end of said ventilator and in the lower of said compartments for closing off same.

2. A ventilator for a passenger vehicle comprising upper and lower curved walls extending upwardly through the roof of, and then down towards a side of, the vehicle, a curved partition extending substantially midway between said walls and dividing the space therebetween into two compartments, and a damper in the lower of said compartments for closing ofi same.

3. A ventilator for a passenger vehicle comprising upper and lower curved walls extending upwardly through the roof of, and then down towards a side of, the vehicle, a curved partition extending substantially midway between said walls and dividing the space therebetween into I two compartments, a damper in the entrance of between said walls, from the inlet of said ventilator to said dampers and dividing the space between said walls into upper and lower compartments, and an adjustable damper in the lower of said compartments for closing off same.

5. A ventilator for a passenger vehicle comprising curved upper and lower walls extending upwardly through the roof of, and then down towards a side of said vehicle, balanced back draft dampers extending between said walls adjacent the exit of said ventilator, a curved partition extending substantially midway between said walls, from the inlet of said ventilator to said dampers and dividing the space between said walls into two compartments, and an adjustable damper in one of said compartments for closing off same.

6. A ventilator for a passenger vehicle comprising curved upper and. lower walls extending upwardly through the roof of, and then down towards a side of said vehicle, balanced back draft dampers extending between said walls adjacent the exit of said ventilator, a curved partition extending substantially midway between said walls, from the inlet of said ventilator to said dampers and dividing the space between said walls into two compartments, an adjustable damper in the entrance of the lower of said compartments for closing oiT same, and means for adjusting said adjustable damper from the interior of said vehicle.

SAMUEL M. ANDERSON. 

